Weights and Measurements

The millimeter of mercury (mmHg) is defined as the pressure exerted at the base of a column of fluid exactly 1 millimeter (mm) high, and the fluid density is exactly 13.5951 gram per cubic centimeter (g/cm³), at a physical location where the gravity acceleration is exactly 9.80665 m/sec²[...]

The online number conversions include conversions between binary, octal, decimal and hexadecimal numbers[...]